An audio frequency or audible frequency (AF) is a periodic vibration whose frequency is audible to the average human. The SI unit of frequency is the...

Audio frequency-shift keying (AFSK) is a modulation technique by which digital data is represented by changes in the frequency (pitch) of an audio tone...

such as mechanical vibrations, audio signals (sound), radio waves, and light. For example, if a heart beats at a frequency of 120 times per minute (2 hertz)...

cannot eliminate these entirely. Consequently, practical ADCs at audio frequencies typically do not exhibit aliasing, aperture error, and are not limited...

mechanical system in the frequency range from around 20 kHz to around 300 GHz. This is roughly between the upper limit of audio frequencies and the lower limit...

a series of binary numbers for digital signals. Audio signals have frequencies in the audio frequency range of roughly 20 to 20,000 Hz, which corresponds...

Audio Frequency Modulation (AFM) is an audio recording standard used by Betamax and VHS Hi-Fi stereo, 8mm and Hi8 video systems. AFM is mono on 8mm systems...

Audio crossovers are a type of electronic filter circuitry that splits an audio signal into two or more frequency ranges, so that the signals can be sent...

In analog frequency modulation, such as radio broadcasting, of an audio signal representing voice or music, the instantaneous frequency deviation, i...

reproduction is the process of adjusting the volume of different frequency bands within an audio signal. The circuit or equipment used to achieve this is called...

voice frequency (VF) or voice band is the range of audio frequencies used for the transmission of speech. In telephony, the usable voice frequency band...

use 3D-form of frequency response surface. Frequency response requirements differ depending on the application. In high fidelity audio, an amplifier requires...

with standard digital telephony "toll quality". It extends the frequency range of audio signals transmitted over telephone lines, resulting in higher quality...

different frequency bands, as with wideband percussion and high-amplitude bass notes. For most audio applications more power is needed at low frequencies. This...

signal, an electrical representation of sound Audio frequency, a frequency in the audio spectrum Digital audio, representation of sound in a form processed...

whose oscillation frequency is controlled by a voltage input. The applied input voltage determines the instantaneous oscillation frequency. Consequently,...

two broad classes: Audio frequency chokes—designed to block audio and power line frequencies while allowing DC to pass Radio frequency chokes—designed to...

An audio filter is a frequency-dependent circuit, working in the audio frequency range, 0 Hz to 20 kHz. Audio filters can amplify (boost), pass or attenuate...

In a radio receiver, a beat frequency oscillator or BFO is a dedicated oscillator used to create an audio frequency signal from Morse code radiotelegraphy...

frequency extender is an electronic device that expands the usable frequency range of POTS telephone lines. It also allows high-fidelity analog audio...

capable of very high frequency response ranges – up to radio frequency and many of the directly heated single-ended triode (DH-SET) audio amplifiers use radio...

known as Stuttgart pitch) is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of...

qualities of a sound source such as amplitude, distortion, frequency response. Once an audio source's information has been observed, the information revealed...

followed by a detector (demodulator) circuit to extract the audio signal and usually an audio frequency amplifier. This type of receiver was popular in the 1920s...

broadcasts of music and general audio (in the audio spectrum). FM radio stations use the very high frequency range of radio frequencies. Throughout the world,...

capabilities. AF Audio-frequency signal generators generate signals in the audio-frequency range and above. An early example was the HP200A audio oscillator...

Audio mixing is the process by which multiple sounds are combined into one or more audio channels. In the process, a source's volume level, frequency...

Audio induction loop systems, also called audio-frequency induction loops (AFILs) or hearing loops, are an assistive listening technology for individuals...

intermediate to the higher radio-frequency (RF) signal from the antenna and the lower (baseband) audio or video frequency that the receiver is recovering...

the field of audio synthesizers, to distinguish it from an audio frequency oscillator. An audio oscillator produces frequencies in the audio range, 20 Hz...